Remove cfg(bootstrap)

Foe the  bootstrap bump

library/compiler-builtins/compiler-builtins/src/macros.rs

@@ -433,18 +433,6 @@ macro_rules! intrinsics {
     ) => (
         // `#[naked]` definitions are referenced by other places, so we can't use `cfg` like the others
         pub mod $name {
-            // FIXME: when bootstrap supports `#[unsafe(naked)]` this duplication can be removed
-            #[cfg(bootstrap)]
-            #[naked]
-            #[allow(unused_unsafe)]
-            $(#[$($attr)*])*
-            #[cfg_attr(not(feature = "mangled-names"), no_mangle)]
-            #[cfg_attr(not(any(all(windows, target_env = "gnu"), target_os = "cygwin")), linkage = "weak")]
-            pub unsafe extern $abi fn $name( $($argname: $ty),* ) $(-> $ret)? {
-                unsafe { $($body)* }
-            }
-
-            #[cfg(not(bootstrap))]
             #[unsafe(naked)]
             $(#[$($attr)*])*
             #[cfg_attr(not(feature = "mangled-names"), no_mangle)]